157631501 has 4 divisors (see below), whose sum is σ = 163067100. Its totient is φ = 152195904.

The previous prime is 157631477. The next prime is 157631519. The reversal of 157631501 is 105136751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108701476 + 48930025 = 10426^2 + 6995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157631501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 5435569 = 157631501 / (1 + 5 + 7 + 6 + 3 + 1 + 5 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157631401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2717756 + ... + 2717813.

It is an arithmetic number, because the mean of its divisors is an integer number (40766775).

Almost surely, 2^157631501 is an apocalyptic number.

It is an amenable number.

157631501 is a deficient number, since it is larger than the sum of its proper divisors (5435599).

157631501 is an equidigital number, since it uses as much as digits as its factorization.

157631501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5435598.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 157631501 is about 12555.1384301409. The cubic root of 157631501 is about 540.1914056270.

The spelling of 157631501 in words is "one hundred fifty-seven million, six hundred thirty-one thousand, five hundred one".